I have a little project which does throw an exception when i let it run. The problem is here TestObject. As this is also removed from Java 11 i added: compile 'com. I also found some other information in how to migrate a java 8 app to java 9 modules, where i found this: compile group: 'javax. RuntimeException: javax. ContextFactory] at java. Doe J. Doe 1 1 gold badge 3 3 silver badges 9 9 bronze badges.
In java 11, these libraries were removed from JDK. You need to add the libs as dependencies. Check this: blog. NeplatnyUdaj i already added those dependencies. Otherwise, the application would not compile. For that reason i added org. If these are wrong, please tell me which one to use.
I followed the instructions in the first comment above. Adding jaxb-core and jaxb-impl to my lib directory solved my problems. Does this answer your question? Add a comment. Active Oldest Votes. It is required to have 2 entries for jaxb: requires java.
The only two dependencies required are: compile group: 'javax. Jeremy Jeremy 2 2 bronze badges. For me this was also the issue, it only appeared when running JaxbContext in multiple threads. Solution that I would suggest is to define JaxbContext as a separate dependency or Spring bean and also as a bonus, it is recommended by Oracle to only create JaxbContext once anyway: javaee. Donatello Donatello 2, 3 3 gold badges 25 25 silver badges 33 33 bronze badges. Could you please check the question stackoverflow.
I have AppClassLoader as you can see in the stacktrace provided but I'sm still getting javax. In your case, I suggest you to add the jaxb-runtime from glassfish, instead of the one from Sun which is more or less deprecated if I remember well — Donatello.
I was using that one from Glassfish, but I was still getting the same error. Make you see all the classes you expect to be returned from the unmarshaller in the list. When dealing with a large schema that spans across a large number of classes and packages, this is one possible cause of a problem.
If you are binding classes that are generated from XJC, then the easiest way to include all the classes is to specify the generated ObjectFactory class es.
Because of the "strange" way that element default values in XML Schema work, people often get confused about their behavior. This section describes how this works. When a class has an element property with the default value, and if the document you are reading is missing the element, then the unmarshaller does not fill the field with the default value.
Instead, the unmarshaller fills in the field when the element is present but the content is missing. This is consistent with the XML Schema spec, where it essentially states that the element defaults do not kick in when the element is absent, so unfortunately we can't change this behavior.
Depending on your expectation, using a field initializer may achieve what you are looking for. Alternatively, attribute default values work in a way that agrees with the typical expectation, so consider using that. Also, see Element default values and marshalling. This is the typical use case, but in some situations this is not desirable.
When a document is large, it's usually because there's repetitive parts in it. Perhaps it's a purchase order with a large list of line items, or perhaps it's an XML log file with large number of log entries. Your program acts on a single chunk, and then throws it away. In this way, you'll be only keeping at most one chunk in memory, which allows you to process large documents.
See the streaming-unmarshalling example and the partial-unmarshalling example in the JAXB RI distribution for more about how to do this. The streaming-unmarshalling example has an advantage that it can handle chunks at arbitrary nest level, yet it requires you to deal with the push model JAXB unmarshaller will " push " new chunk to you and you'll need to process them right there.
In contrast, the partial-unmarshalling example works in a pull model which usually makes the processing easier , but this approach has some limitations in databinding portions other than the repeated part. The techniques discussed above can be used to handle this case as well, since they let you unmarshal chunks one by one. By default, a JAXB marshaller uses random namespace prefixes such as ns1 , ns2 , While this is perfectly valid XML wrt the schema, for human readability, you might want to change them to something that makes more sense.
See the namespace-prefix sample in the distribution for more details. Because of a "strange" way element default values in XML Schema work, people often get confused about its behavior. When a class has an element property with the default value, and if a value is null, then the marshaller will not produce the corresponding element in XML:. This is consistent with the XML Schema spec, where it essentially states that the element defaults do not kick in when the element is absent.
Attribute default values do not have this problem, so if you can change the schema, changing it to an attribute is usually a better idea. Alternatively, depending on your expectation, setting the field to a default value in Java may achieve what you are looking for. Also, see Element default values and unmarshalling.
So perhaps you have a class like this:. There're seven Marshaller. If you are writing to a file, a socket, or memory, then you should use the version that takes OutputStream. Unless you change the target encoding to something else default is UTF-8 , there's a special marshaller codepath for OutputStream , which makes it run really fast. You can also write to Writer , but in this case you'll be responsible for encoding characters, so in general you need to be careful. This is bit unintuitive, but you'll do it like this:.
And after the method invocation you get a complete DOM tree that represents the marshalled document. The version that takes ContentHandler is useful when you need a custom formatting needs like you want each attribute to be in new line, etc , but otherwise they are not very interesting if you are writing a whole document.
This changes the behaviors of the marshaller so that it works better in this situation. If you are writing to an OutputStream or Writer and generally sending it to someone else, you can do something like this:. Like I mentioned, this is probably the fastest, even though println isn't very pretty.
The downside of this approach is that if the ancestor elements declare the namespaces, JAXB won't be able to take advantage of them.
You can also marshal an object as a subtree of an existing DOM tree. To do this, you pass the Element object as the second parameter, and the marshaller will marshal an object as a child of this node.
StAX is also very convenient for doing this sort of things. Finally, you can marshal an object as a subtree into ContentHandler , but it requires a fair amount of SAX programming experience, and it goes beyond the scope of this entry. Another common use case is where you have an object that doesn't have XmlRootElement on it. JAXB allows you to marshal it like this:. You can actually use it with a class that has XmlRootElement , and that simply renames the root element name.
At the first glance the second Point. In this example, both the class and the instance are Point , so you won't see xsi :type. But if they are different, you'll see it. This can be also used to marshal a simple object, like String or an integer.
But unfortunately it cannot be used to marshal objects like List or Map , as they aren't handled as the first-class citizen in the JAXB world. For example, dom4j has DocumentResult that extends Result , so you can do:.
This amounts to looking at the same XML by using different schema, and again this is much more efficient than going through ByteArrayOutputStream. In this section, we'll discuss the possible causes and how to resolve this. The 1 cause of extra namespace declarations is due to the DOM mapping. Note that the two namespace declarations are copied over, but c is not because it's overridden.
Also not that JAXB is not touching the whitespace in document. This copying of namespace declarations is necessary to preserve the infoset in the input document.
Now, imagine what happens when you marshal this back to XML. Despite the fact that in this example neither b nor c prefixes are in use, JAXB cannot delete them, because it doesn't know if those attributes are significant to the application or not. Therefore, this could end up producing XML with "extra namespace declarations" like:. Resolving this problem is not possible in the general case, but sometimes one of the following strategy works:. In such a case, adding explicit type attribute avoids the use of DOM, so things will work as expected.
The wildcard processing mode " strict " would force a typed binding, and thereby eliminate any DOM mapping. You might be able to manulally go into the DOM tree and remove unnecessary namespace declarations, if your application knows what are necessary and what are not.
Schemagen tools by default come in as CLI, ant task, and Maven plugin. These interfaces allow you to invoke schemagen functionality from your program. If the classes you'd like to generate schema from are already available as java. The CLI interface public static int com. You can pass in all the schemagen command-line arguments as a string array, and get the exit code as an int value.
Messages are sent to System. Ant task can be invoked very easily from a non-Ant program. The schemagen ant task is defined in the SchemaGenTask class,. The above two interfaces are built on top of externally committed contracts, so they'll evolve only in a compatibile way. The downside is that the amount of control you can exercise over them would be limited.
But be warned that those interfaces are subject to change in the future versions, despite our best effort to preserve them. Most of those interfaces are defined and well-documented in the com.
You can see how the schemagen tools are eventually calling into this API at the implementaion of SchemaGenerator class. This section discusses how you can change the generated XML schema. For changes that also affect the infoset such as changing elements to attributes, namespaces, etc.
As of JAXB 2. The JAXB project is currently lacking resources to attack this problem, and therefore looking for volunteers to work on this project. The basic idea would be to define enough annotations to cover the basic constraint facets such as length, enumerations, pattern, etc.
The schema generator would have to be then extended to honor those annotations and generate schemas accordingly. If you are interested in picking up this task, let us know! Required to compile against JAXB. Minimum requirement to compile is jaxb-api. If a client application is running on an environment where JAXB runtime is provided, jaxb-api is all that is needed. If client application needs to include the runtime, e.
To generate JAXB classes from schema community maven-jaxb2-plugin can be used. Alternatively to community plugins, there are tooling artifacts jaxb-xjc and jaxb-jxc, which can be used for java from XML schema generation and vice versa. See also xml schema compiler usage. Where are schemagen and xjc command line scripts available in JavaSE prior to 11? These are included only in the zip distribution. Starting from 2. There are only a few things to be aware of.
JAXB does reflectively access private members of the class, so client application if loaded from module path needs to "open" packages containing jaxb classes to JAXB. Module java. Similar to endorsed mechanism prior to Java 9, starting from 9 there is an "upgrade module" mechanism which can replace content of JDK module.
JavaSE bundled java. Since java. No RI-specific vendor extensions are supported: This is so that portability across different JavaSE 6 implementations will be guaranteed.
Therefore, if you develop an application that uses JAXB 2. If you'd like to reduce the footprint of your application by taking advantage of a JAXB implementation in JavaSE, you can take the following steps:. You will no longer have to ship jaxb-api. This doesn't require any change to your code. When you do this, be sure to test your application since it's not very easy to find all such dependencies. Each version of JavaSE 6, 7, 8, There are several ways to achieve this:.
Place the jaxb-api. Do not put other JAXB jars into the endorsed directory. And put jaxb-impl, jaxb-core to classpath of your application. This would affect any other applications that use this JRE, and it's easy.
On the other hand, in various scenarios you may not be able to alter the JRE. Use the system property java. The directory must not contain any other jaxb artifacts like jaxb-impl. This allows you use to use different version of JAXB for different applications. No matter which approach you take, make sure not to include jar files other than jaxb-api. Doing so, for example including jaxb-xjc.
See the endorsed directory mechanism for more details. JavaSE has never shipped an Ant task implementation, so we are just following that tradition. There's an process-wise overhead of adding additional dependencies during the JavaSE build, and there would likely be some runtime dependency issues in having a class in tools. We are thinking about perhaps releasing a small jar that only contains the ant task for JDK6.
Therefore other JavaSE vendors may not implement that at all, or do so in a different class name, etc. This is for information purposes only. You can use any version of these with any version of JDK without worrying about implementation conflicts. This is due to a bug, and so far the only way to fix this is to compile your project with JavaSE 5.
Here is what's happening. This attribute marks types and methods that are not present in the source file but generated by the compiler. When package-info.
Later it is discovered that the corresponding VM change needs to be made to allow this 0x combination , but apparently no one realized the real implication of this namely, 0x will break all the past JVMs.
Of course, this problem is eventually discovered , but as of this writing there's still no fix for this. In this case, for the best performance you should have just one instance of JAXBContext in your whole application like this:.
In that case, consider pooling Unmarshaller objects. Different threads may reuse one Unmarshaller instance, as long as you don't use one instance from two threads at the same time. It is marked "experimental" not because the feature is unstable nor unreliable, but rather because it's not a part of the JAXB specification and therefore the level of commitment to compatibility is lower. All the other command-line options of the XJC binding compiler can be applied.
The customization syntax for DTD is roughly based on the ver. The deviations from this document are:. The whitespace attribute of the conversion element takes " preserve ", " replace ", and " collapse " instead of " preserve ", " normalize ", and " collapse " as specified in the document.
The interface customization just generates marker interfaces with no method. The dependencies section inside the plugin element can be used to specify additional XJC plugins.
This section discusses the non-trivial interaction between XML and sockets, and how you can design a protocol correctly.
As a result, a naive attempt to keep one OutputStream open and marshal objects multiple times fails. One easy way to work around this limitation is to design your protocol so that the data on the wire will look like the following:. This works as a container to send multiple "messages", and this is also an excellent opportunity to do the hand-shaking e.
You can use the JAXB marshaller to produce such message. Of course, you can choose any tag names freely, and each message can have different tag names. After that, every time you call a JAXB unmarshaller, you'll get the next message. The binding compiler can be launched using the appropriate xjc shell script in the bin directory for your platform. If all else fails, you should be able to execute the jaxb-xjc.
This is equivalent of running xjc. By default, the XJC binding compiler performs strict validation of the source schema before processing it.
Use this option to disable strict schema validation. This does not mean that the binding compiler will not perform any validation, it simply means that it will perform less-strict validation. Appendix E. In some cases, you may be allowed to use them in the "-extension" mode enabled by this switch. In the default strict mode, you are also limited to using only the binding customizations defined in the specification.
By using the "-extension" switch, you will be allowed to use the Overview. Specify one or more external binding files to process. Each binding file must have it's own -b switch. The syntax of the external binding files is extremely flexible. You may have a single binding file that contains customizations for multiple schemas or you can break the customizations into multiple bindings files:.
In addition, the ordering of the schema files and binding files on the command line does not matter. By default, the XJC binding compiler will generate the Java content classes in the current directory. Use this option to specify an alternate output directory. The output directory must already exist, the XJC binding compiler will not create it for you. If -encoding is not specified, the platform default encoding is used.
Specifying a target package via this command-line option overrides any binding customization for package name and the default package name algorithm defined in the specification.
The format is [user[:password] ]proxyHost[:proxyPort]. The old -host and -port are still supported by the RI for backwards compatibility, but they have been deprecated. Specify catalog files to resolve external entity references. By default, the XJC binding compiler does not write-protect the Java source files it generates.
Use this option to force the XJC binding compiler to mark the generated Java sources read-only. Using this switch causes the generated code to internalize those annotations into the other generated classes.
Supress the generation of a file header comment that includes some note and timestamp. Using this makes the generated code more diff -friendly. Avoid generating code that relies on any JAXB 2. This will allow the generated code to run with JAXB 2. Treat input as WSDL and compile schemas inside it experimental,unsupported. Be extra verbose, such as printing informational messages or displaying stack traces upon some errors..
Specify one or more schema files to compile. If you specify a directory, then xjc will scan it for all schema files and compile them. This feature causes all of the generated method signatures to include the synchronized keyword. This feature causes all of the generated code to have Generated annotation. Generate an episode file from this compilation, so that other schemas that rely on this schema can be compiled later and rely on classes that are generated from this compilation.
The generated episode file is really just a JAXB customization file but with vendor extensions. These options have been deprecated and replaced with the -httpproxy option. For backwards compatibility, we will continue to support these options, but they will no longer be documented and may be removed from future releases.
Since the JAXB 2. Therefore, this switch is obsolete and has been removed. In general, it is safest to compile all related schemas as a single unit with the same binding compiler switches.
Please keep the following list of restrictions in mind when running xjc. Most of these issues only apply when compiling multiple schemas with multiple invocations of xjc. To compile multiple schemas at the same time, keep the following precedence rules for the target Java package name in mind:. The -p command line option takes the highest precedence.
If no targetNamespace is declared, use a hardcoded package named "generated". All schemas being compiled into the same Java package must be submitted to the XJC binding compiler at the same time - they cannot be compiled independently and work as expected.
Element substitution groups spread across multiple schema files must be compiled at the same time. XJC produces a set of packages containing Java source files and also jaxb. When generated, jaxb. The jaxb-xjc. To use XJCTask , include the following statement in your build. For detailed examples of using this task, refer to any of the build. For example, you can define system properties or set the maximum Java heap size here.
A schema file to be compiled. A file name can be relative to the build script base directory , or an URL. If specified, generated code will be placed under this Java package.
This option is equivalent to the "-p" command-line switch. Generated code will be written under this directory. If it is not specified, the platform default encoding is used. Generate Java source files in the read-only mode if true is specified.
Generate a header in each generated file indicating that this file is generated by such and such version of JAXB RI when. If set to true , the XJC binding compiler will run in the extension mode. Otherwise, it will run in the strict conformance mode. Equivalent of the " -extension " command line switch. The default is false. Specify the catalog file to resolve external entity references.
See the catalog-resolver sample for details. See the up-to-date check section for details. Specifies the runtime environment in which the generated code is supposed to run.
Expects 2. Specifies the schema language to compile. For the syntax, see "path-like structure". Additional command line arguments passed to the XJC. For details about the syntax, see the relevant section in the Ant manual. This nested element can be used to specify various options not natively supported in the xjc Ant task.
For example, currently there is no native support for the following xjc command-line options:. Files specified with this nested element will be taken into account when the XJC task does the up-to-date check. The xmlcatalog element is used to resolve entities when parsing schema documents.
Please see the Generated Resource Files for more detail. By default, the XJC binding compiler always compiles the inputs.
However, with a little additional setting, it can compare timestamps of the input files and output files and skip compilation if the files are up-to-date.
Ideally, the program should be able to find out all the inputs and outputs and compare their timestamps, but this is difficult and time-consuming. If any one of the "depends" file has a more recent timestamp than some of the files in the "produces" set, it will compile the inputs. Otherwise it will skip the compilation. This will allow you to say, for example "if any of the. A change in a schema or an external binding file often results in a Java file that stops being generated.
To avoid such an "orphan" file, it is often desirable to isolate all the generated code into a particular package and delete it before compiling a schema. This can be done by using the removeOldOutput attribute. This option allows you to remove all the files that match the "produces" filesets before a compilation.
Be careful when you use this option so that you don't delete important files. Compile myschema. Compile all XML Schema files in the src directory and place the generated files under the appropriate packages in the src directory:. Compile all XML Schema files in the src directory together with binding files in the same directory and places the generated files under the appropriate packages in the src directory.
This example assumes that binding files contain package customizations. This example doesn't search subdirectories of the src directory to look for schema files. Compile abc. Compilation only happens when abc. Files in these two directories will be wiped away before a compilation, so don't add your own code in those directories. Note that the additional mkdir task is necessary because Ant's fileset requires the directory specified by the dir attribute to exist.
More complicated example of up-to-date check. In this example, we assume that you have a large set of schema documents that reference each other, with DTDs that describe the schema documents.
Compile all XML Schema files in the src directory and subdirectories, excluding files named debug. This example also specifies the -nv option, which disables the strict schema correctness checking:.
If you depend on a proxy server to resolve the location of imported or included schemas as you might if you're behind a firewall , you need to make the hostname and port number accessible to the JVM hosting ant. For example, from DOS:. We also provide an Ant task to run the schema generator - see the instructions for SchemaGen Ant Task. The schema generator can be launched using the appropriate schemagen shell script in the bin directory for your platform.
Otherwise you will see errors when generating your schema. When people develop additional schemas that depend on what this schemagen invocation produces, they can use this episode file to have their generated code refer to your classes.
The current schema generator simply creates a schema file for each namespace referenced in your Java classes. There is no way to control the name of the generated schema files at this time. Use SchemaGen Ant Task for that purpose. To use SchemaGenTask , include the following statement in your build. This maps SchemaGenTask to an Ant task named schemagen. For detailed examples of using this task, refer to the build. If specified, generate an episode file in the specified name.
For more about the episode file, see -episode. Control the file name of the generated schema. This element takes a mandatory namespace attribute and a mandaotry file attribute. When this element is present, the schema document generated for the specified namespace will be placed in the specified file name.
The file name is interpreted as relative to the destdir attribute. In the absence of the destdir attribute, file names are relative to the project base directory.
This element can be specified multiple times. A path-like structure that represents the classpath. Various people in the community have developed plugins for XJC that you can use today. This document describes additional binding customizations that can be used to control the generated source code. Namespace Prefix Mapping. Character Escaping Control. XML Declaration Control. Jaxb Annotation Control. This is the general procedure:. The application developer provides an implementation of com.
This class is then set on the marshaller via the RI specific property com. The com. NamespacePrefixMapper class has the following method that you need to implement:.
See the Sample Apps sample application for a detailed example. This property controls the string used for the indentation of XML. An element of depth k will be indented by printing this string k times. Note that the " jaxb. See the API documentation for javax. Marshaller interface for details of this property. Unfortunately, due to various technical reasons, the default behavior may not meet your expectations. If you need to handle escaping more adroitly than the default manner, you can do so by doing the following:.
Write a class that implements the com. CharacterEscapeHandler interface. See the Sample Apps sample application for more details. The 2. Please refer to the Marshaller javadoc for a complete description of the behavior. Note that this property interacts with the Marshaller. This property provides support for a custom com. Accessor implementation. It allows the user to control the access to class fields and properties.
Note the following:. The value of this attribute is a whitespace-separated list of namespace prefixes. For more information, please refer to section 6.
Alternative Derivation-by-restriction Binding Mode - Alternative derivation-by-restriction binding mode. Allow separate compilations to perform element substitutions - Allow separate compilations to perform element substitutions. The JAXB RI supports the use of schema component designator as a means of specifying the customization target of all standard JAXB customizations as well as vendor extensions explained below.
Compared to the standard XPath based approach, SCD allows more robust and concise way of identifying a target of a customization. For more about SCD, refer to the scd example. LayerRateAdapter , which extends from XmlAdapter. In the above example, all the use of xsd:dateTime type is adapter by org. MyAdapterImpl to org. This experimental binding mode can be enabled as a part of the global binding. Charles Stevens Charles Stevens 1, 15 15 silver badges 29 29 bronze badges.
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